Testing device for bank notes

ABSTRACT

A testing device for bank notes, or similar instruments of payment in sheet form for automatic vending machines, has a testing channel (20) with a transport device (7) and scanning devices for recognizing and checking the authenticity of the bank note (3). An input channel (2) of variable width is in front of the testing channel (20). The input channel (2) includes two channel halves (21), one on either side of the longitudinal center axis (22) of the input channel (2). The two channel halves (21) can be adjusted synchronously against the force of a spring. In their contact position, the channel halves (21) determine the minimum width of the channel, and in their separated end position they determine the maximum width. A bank note (3) of any type is introduced into the input channel (2) at its locked maximum channel width as far as a passage detector (19) arranged in a starting region of the testing channel (20). The passage detector (19) unlocks the channel halves (21), as a result of which the side walls (23) of the channel halves (21) are pressed by the force of a spring against the bank note (3) and align it centrally with the testing channel (20).

BACKGROUND OF THE INVENTION

The invention relates to a testing device for bank notes or similarlegal tender in sheet form for automatic vending machines, the testingdevice being of the type which includes a transporting device and atesting channel equipped with scanning devices for recognizing andchecking the authenticity of the bank note, the testing channel beingpreceded by an input channel having an adjustable width.

DE 2,747,795.A1 already discloses a document reader in which thepositioning of the document during passage through the transportingchannel relative to the transporting elements is set as a function ofthe width of the document. In other words, the transporting meanscharacterized by rollers are stationary but the positioning of thedocument during transport is determined by adjustment means which setthe position relative to the transporting means as a function of thewidth of the document. The transporting channel of the document readerthrough which the documents are guided during the scanning process isequipped with an adjustable side wall for a determination of eithercertain widths of the transporting channel or a width range foroperation with documents of any desired width within this range. Thescanning unit of the document reader may be preceded by an input unit,with adjustment elements for the channel width being provided in theinput unit and in the scanning unit. The adjustment elements for thewidth of the transporting channel in the scanning unit here respond intheir width setting as a function of the position of the width settingelements of the input unit. Thus separate width adjustment elements arerequired for the channel of the input unit and for the channel of thescanning unit which is extremely expensive from a manufacturing point ofview. Since the width setting of the channels is effected in each caseby changing the position of a movable side wall relative to a fixed sidewall, the position of the longitudinal center axis of the channelschanges correspondingly. Such a displacement of the longitudinal centeraxis of the channel of the scanning unit as a function of the width ofthe document to be checked is a drawback insofar as, for the checking ofbank notes which generally have the same identifying marks at the samedistance from their longitudinal center axis regardless of their width,a number of scanning devices corresponding to the number of differentwidths must be used for the same identifying feature on several banknotes of different widths.

SUMMARY OF THE INVENTION

It is the object of the invention to provide a testing device of theabove mentioned type which overall has a simple and compact structureand permits accurate input of bank notes of different widths in acentrally aligned longitudinal direction toward and into a testingchannel.

This is accomplished by the invention in that

the input channel is composed of two channel halves that are separatedalong the longitudinal center axis of the input channel and areadjustable in parallel and in synchronism against the force of a spring;

in their contacting position, the channel halves define the minimumchannel width and in their separated end position they define themaximum channel width;

the introduction of each bank note into the input channel, when themaximum channel width is locked in, is effected up to a passage detectordisposed in the starting region of the testing channel; and

the passage detector causes the locking of the channel halves to bereleased so that the side walls of the channel halves place themselvesagainst the bank note under the force of the spring and align the noteso that it is centered in the middle of the testing channel.

The significant advantage realized by the invention is the preciselyflush alignment of the longitudinal center axes of bank notes ofdifferent widths that are introduced longitudinally into the inputchannel with the longitudinal center axis of the testing channel.Consequently, a width adjustment of the testing channel is unnecessarywhich, on the one hand, results in a relatively simple configurationand, on the other hand, permits the simultaneous use of certainmeasuring locations of the scanning device for bank notes of differentwidths. Due to the synchronous parallel adjustment of the channel halvesof the input channel between the minimum channel width and the maximumchannel width, each bank note of any desired width falling within theabove-mentioned channel width range can have its longitudinal centeraligned to coincide with the center of the testing channel.

In order to realize an automatic adjustment of the testing device forthe checking of bank notes of a given width, an advantageous feature ofthe invention couples the synchronous adjustment of the channel halveswith a measuring device for detecting the width of the bank notes bymeans of which an appropriate bank note checking program dependent onthe width of the bank notes can be activated in the scanning devices.

In order to realize a structurally simple operation of the channelhalves of the input channel, the channel halves, according to anadvantageous modification of the invention, are in operative connectionwith a lever bar assembly which, by way of a control disc coupled with adrive motor by means of a worm gear, can be charged to effect the properadjustment of the channel halves.

In a further advantageous embodiment of the invention, the channelhalves, which have a U-shaped cross section, are guided so as to beslidably movable, by way of bearings shaped onto their upper faces, onthree equidistant transverse shafts that are held in oppositely disposedsupporting walls. This results in an accurately parallel guidance of thechannel halves.

Advisably the center transverse shaft is provided in its center with abearing pin for accommodating a three-armed angle lever of the lever barassembly whose flush lever arms are articulated to the oppositelydisposed longitudinal sides of the channel halves and whoserectangularly angled lever arm accommodates a pin at its end. Due to theaction of a tension spring connected with this lever arm and the reartransverse axis, this pin lies in force locking contact at the free endsof an adjustment rod of the lever bar assembly. Thus a synchronousparallel displacement of the channel halves relative to one another isprovided by simple means. Advisably, the free end region of theadjustment rod is here held in a pin guide that engages in a long holeor slot and is articulated at its other end to a two-sided lever whichis pivotal about a bearing pin disposed in the longitudinal center axisof the testing channel. The free end of this lever, which is configuredas a cam, lies against the control disc. Moreover, the control disc andthe worm wheel of the worm gear are here preferably connected with oneanother so that they rotate together and are rotatably mounted on acommon shaft.

In an advantageous embodiment of the solution according to the inventionthe transporting device for the bank notes includes a drive motor whosedirection of rotation can be reversed for driving two endless toothedbelts that are parallel to one another at a defined distance and whichrest on pairs of rollers that are arranged within the width of the pathof the bank notes in the region of the testing channel. The rollers areeach opposed, in the direction of movement of the bank notes, by aspring tensioned pressure roller or runner, with the front pressurerollers or runners that directly face the input channel being removablefrom the toothed belts under positive control against the force of thespring. This makes it possible to insert a bank note, if the frontpressure rollers or runners are lifted away, and push it manually intothe intake region of the testing channel and then, after the frontcontact rollers or runners have been lowered, let the forced transportof the bank note through the testing channel by means of thetransporting device begin.

In order to obtain a structurally simple embodiment of the adjustment ofthe front pressure rollers, an advantageous feature of the inventionprovides that the axes of the front pressure rollers and pins shapedlaterally to the runners, in order to properly control their heightadjustment, are in operative connection, by way of a spring-tensionedlever arrangement, with a cam disc which is fastened to and rotates withthe control disc that charges the channel halves, the cam disc beingrotatably mounted on the shaft of the worm wheel of the worm gear drive.Advisably the lever arrangement includes two flat levers that arelongitudinally displaceable on the oppositely disposed side walls of thetesting device and are each provided with a cam track that is associatedwith the shaft of the corresponding front pressure roller and with oneof the pins of the front runners, respectively. At their ends oppositethe cam track, the flat levers are each provided with an indentationinto which engage the diametral arms of a three-armed pivot lever thatis charged by the cam disc. Additionally it is preferably provided thatthe three-armed pivot lever is mounted on the bearing pin disposed inthe longitudinal center axis of the testing channel and its cam arm,which is angled away from the diametral arms, rests against the cam discdue to the action of a tension spring that acts on the respective arm.

In order to monitor the adjustment of the channel halves of the inputchannel and the front pressure rollers or runners in a furtheradvantageous embodiment of the solution according to the invention, aspring tensioned two-armed lever is supported on the bearing pinaccommodating the three-armed pivot lever of the lever arrangement andthe two-sided lever of the lever bar assembly. This two-armed levercooperates, on the one hand, with a cam disc that is coupled with thedrive motor and, on the other hand, with the forks of two fork couplersthat generate positioning pulses. Advisably the end of the two-armedlever facing the cam disc is here configured as a cam which, due to theaction of a tension spring extending between an angled portion of thetwo-armed lever and a pin disposed at the upper wall of the testingdevice, lies against the cam disc. The cam disc is fastened to the wormwheel of the worm gear so as to rotate together with it and is alsorotatably supported on the shaft of the worm wheel.

In order to easily determine the opening width of the channel halves ofthe input channel when a bank note of a certain width is inserted, themeasuring device for determining the width of the bank notes includes,as an advantageous feature of the invention, a disc equipped with a ringof perforations. The ring of perforations, which is arranged at an angleto the disc, moves in the forks of two fork couplers that are arrangedwith an offset of 90° to one another and generate positioning pulses.The disc with the ring of perforations supports a toothed wheel thatmeshes with a toothed ring segment that is connected with the anglelever for making adjustments to the channel halves.

BRIEF DESCRIPTION OF THE DRAWINGS

The concept on which the invention is based will be described in greaterdetail in the description below with reference to an embodiment that isillustrated in the drawing figures, in which:

FIG. 1 is a side view of a bank note testing device including an inputchannel upstream and a stacking device downstream for storing the banknotes;

FIG. 2 is a front view of the arrangement of FIG. 1 viewed in thedirection of arrow II;

FIG. 3 is a bottom view in a simplified representation of the testingdevice of FIG. 1 and its associated input channel;

FIG. 4 is an illustration according to FIG. 3 but without the two-armedlever and without the cam disc associated with this lever; and

FIG. 5, is an illustration according to FIG. 3 but without the two-armedlever and the associated cam disc and without the two-sided lever andits associated control disc.

DESCRIPTION OF THE PREFERRED EMBODIMENT

The bank note testing device 1, which is arranged in a horizontalposition, is preceded by an input channel 2 for a bank note 3. Theoutlet of testing device 1 is directly followed by a 90° transfer guide4 for a bank note 3 leaving testing device 1 for guiding bank note 3 toa stacking device 5 that is attached in a vertical position. Stackingdevice 5 is disposed opposite the charging opening of a bank note stackcontainer 6 which in its interior is provided with a spring-tensionedplate. The transport of bank note 3 in its longitudinal format throughtesting device 1 over the 90° transfer guide 4 into the stackableposition between stacking device 5 and the charging opening of stackcontainer 6 takes place by way of a transporting device 7 that includestwo endless toothed belts 8 extending parallel to one another at acertain distance. Toothed belts 8 are placed onto pairs of reversalrollers 9 in the intake region of testing device 1, intermediate roller10 in the discharge region of testing device 1, deflection rollers 11and 12 of transfer guide 4, supporting rollers 13 in the upper region ofstacking device 5 and non-illustrated drive rollers which are coupled byway of a worm gear with a reversible rotation drive motor, with allrollers being mounted on shafts that are held in side walls 14.Moreover, four spring-tensioned pressure rollers 15 are fastened to sidewalls 14; they lie against the toothed belts 8 in the region of thepairs of reversal rollers 9 and intermediate rollers 10. The bank note 3is thus gripped and carried by pressure rollers 15 in cooperation withtoothed belts 8. The shaft 16 of each pressure roller 15 is held in apivotally movable holder 17 that is fastened in the associated side wall14, with the respective series arranged holders 17 being charged by acommon wire spring 18 in the direction toward toothed belts 8.

In order to determine the presence of a bank note 3 in testing device 1,a passage detector 19 that is coupled with a switching device isdisposed behind the front pressure roller 15 in the path of movement ofbank note 3. Moreover, testing device 1 is equipped with scanningdevices associated in a known manner with testing channel 20, which arenot illustrated in detail, for checking the authenticity of a bank note3.

Input channel 2 is composed of two channel halves 21 that have aU-shaped cross section and can be moved back and forth in parallel andin synchronism relative to the longitudinal center axis 22 of inputchannel 2. In the contact position of channel halves 21, produced byspring force, these channel halves define the minimum channel width ofthe input channel while the separated, lockable end position with thechannel halves 21 being moved apart against the spring force defines themaximum channel width of input channel 2. If input channel 2 is lockedin the maximum channel width, a bank note 3 is pushed manually throughinput channel 2 up to passage detector 19, which then sends a signal tothe switching device that in turn initiates the release of the lock ofchannel halves 21 so that, due to the spring force, the interior facesof side walls 23 of channel halves 21 place themselves against thelongitudinal sides of the bank note and thus align its longitudinalcenter axis precisely with the longitudinal center axis 24 of testingchannel 20.

In order to control the sequence of movements of channel halves 21, aspring tensioned lever bar assembly 25 is provided that is connectedwith the channel halves and can be actuated by means of a control discor cam 26 that is connected to rotate together with the worm wheel 27 ofa worm gear 29 coupled with a drive motor 28. Control cam 26 and wormwheel 27 are mounted so as to rotate on a common shaft 31 that is heldat the upper wall 30 of testing device 1. The drive motor 28, whoseshaft carries a worm 32 that meshes with worm wheel 27, is also fastenedto upper wall 30. In the form of a cam follower 33, the free end of atwo-sided lever 34 lies against control cam 26. This lever 34 isrotatably held on a bearing pin 35 that lies in the longitudinal centeraxis 24 of testing channel 20 and is fastened to upper wall 30. Anadjustment rod 36 articulated to lever 34 extends up to channel halves21 and is held above channel halves 21 by a pin guide 38 that engages ina long hole or slot 37 and whose pin 39 is fastened to upper wall 30.The free end of adjustment rod 36 cooperates with a three-armed anglelever 40 which is coupled with channel halves 21. On their upper faces,channel halves 21 are provided with shaped-on bearings 41 by means ofwhich channel halves 21 are guided so as to slidably move on threeequidistant transverse shafts 42. Supporting walls 43 fastened oppositeone another to upper wall 30 accommodate transverse shafts 42. Themiddle transverse shaft 42 is provided with a pin 44 in its center, onwhich angle lever 40 is pivotally mounted. The mutually flush lever arms45 of angle lever 40 are connected by way of pins 46 with diametrallyoppositely disposed bearing brackets 47 that are shaped onto themutually facing longitudinal sides of channel halves 21. A lever arm 48whose end carries a pin 49 branches off at a right angle from themutually flush lever arms 45 of angle lever 40. Due to the action of atension spring 50 connected with lever arm 48 and the rear transverseshaft 42, this pin 49 lies against the free end of adjustment rod 36.Control cam 26 is thus designed in such a way that, if a bank note 3 isintroduced into the input channel, channel halves 21 take on the lockedmaximum channel width setting shown in FIGS. 3 to 5. The locking ofchannel halves 21 is then released by actuation of drive motor 28 by wayof passage detector 19.

In order to securely grip bank note 3 in the intake region of testingchannel 20, the front, spring tensioned pressure rollers 15 may belifted from toothed belts 8 under a positive control and then loweredagain. For this purpose, the shafts 16 of the front pressure rollers 15are in operative connection by way of a spring tensioned leverarrangement 51 with a cam 52 which is fastened to rotate with controlcam 26 and is mounted on common shaft 31. The shafts 16 of the frontpressure rollers extend outwardly through corresponding notches in theside walls 14 and are here each supported at a cam track 54 that isformed in a flat lever 53. The flat levers 53, which are held to belongitudinally displaceable on the exterior faces of side walls 14, areprovided with an indentation 55 on the side opposite cam track 54 intowhich engage the diametral arms 57 of the three-armed pivot lever 58that extend through respective long holes or slots 56 in side walls 14.Pivot lever 58 is likewise mounted on bearing pin 35 and its camfollower arm 59, which is angled away from the diametral arms 57, liesunder spring tension against cam 52. Between a pin 60 fastened to upperwall 30 and the corresponding arm 57 of pivot lever 58, there extends atension spring 61. Cam 52 is designed in such a way that, with the inputchannel locked at its maximum width, the cams tracks 54 of flat levers53 lift the front pressure rollers 15 away from toothed belts 8. Only ifthe centering of the bank note 3 in its longitudinal center has beencompleted by the unlocked channel halves 21, are the front pressurerollers 15 released by the cam 52, which is charged by drive motor 28,and by the associated lever arrangement 51 so that, because of theaction of wire springs 18, they press bank note 3 against toothed belts8 and thus ensure reliable transport of bank note 3.

In order to monitor the motion sequence of channel halves 21 and offront pressure rollers 15, a two-armed lever 62 is provided which ispivotally mounted on bearing pin 35 and cooperates, on the one hand, byway of a bend 63 with two juxtaposed fork couplers 64 and 65 and, on theother hand, by way of a cam follower 66, with a cam 67. Cam 67 isconnected so as to rotate together with worm wheel 27, which rotates inthe direction of arrow 68. An angled portion 69 branches off from lever62 and is coupled by way of a tension spring 70 with pin 60. In thelocked position of the channel halves 21 of input channel 2, the bend 63of lever 62 is disposed outside of fork couplers 64 and 65. As soon asthe alignment of bank note 3 to its longitudinal center has beencompleted by the unlocked channel halves 21, lever 62 drops into forkcoupler 64, which forwards a corresponding information signal to theswitching device. As soon as the front pressure rollers 15 have beenlowered, lever 62 drops into fork coupler 65 so that the switchingdevice receives a signal for startling transporting device 7. In orderto permit the return of an unacceptable bank note, the channel halvesagain take up their locked position, with lever 62 again engaging infork coupler 64 and there giving a corresponding signal to the switchingdevice. Thereafter, the front pressure rollers are raised again, whichis reported to the switching device by lever 62 exiting from forkcoupler 64.

The detection of the width of the bank note is effected by way of ameasuring device 71 which is coupled with the synchronous adjustment ofchannel halves 21 of input channel 2. Corresponding to the detectedwidth of the inserted bank note, the measuring device initiates anassociated testing program for the scanning devices, that is, the widthof the bank note as determined by the measuring device determines thetesting program that is applicable for this bank note. Measuring device71 includes a disc 72 equipped with a ring of perforations 73 which isplaced at an angle to the disc. Ring of perforations 73 moves in theforks of two fork couplers 74 that are offset by 90° relative to oneanother and generate positioning pulses while additionally permittingthe detection of the direction of rotation of the disc 72 equipped withthe ring of perforations. A toothed wheel 76 is connected withperforation disc 72, which is mounted to rotate concentrically with iton shaft 75; this toothed wheel 76 meshes with a toothed ring segment77. This toothed ring segment 77 is a component of angle lever 40 forthe adjustment of channel halves 21. The translatory movement of channelhalves 21 is thus converted to a rotational movement of perforation disc72 from which results the path traversed by channel halves 21.

The invention has been described and illustrated above with reference toa preferred embodiment thereof and selected features. Of course, theinvention is not limited to this illustration. Instead all features maybe employed alone or in any desired combination, also independently oftheir combination in the claims.

What we claim is:
 1. An improved testing device for bank notes orsimilar legal tender in the form of sheets for automatic vendingmachines, the device including a transportation device (7) and a testingchannel (20) which has a center axis (24) and which is equipped withscanning devices for the detection and authenticity checking of the banknote (3), with the testing channel being preceded by a variable widthinput channel (2) having a longitudinal center axis (22), wherein theimprovement comprises:the input channel (2) is composed of two channelhalves (21) that are separated along the longitudinal center axis (22)of the input channel (2) and that are adjustable in synchronism and inparallel against the force of a spring; the channel halves (21) have acontacting position which defines a minimum channel width and aseparated end position which defines a maximum channel width; theinsertion of each bank note (3) into the input channel (2) occurs withthe channel width locked in its maximum position up to a passagedetector (19) disposed in a starting region of the testing channel (20);and the passage detector (19) initiates the release of the lock of thechannel halves (21) so that the side walls (23) of the channel halves(21) place themselves, due to the force of the spring, against the banknote (3) and align its center with the center axis (24) of the testingchannel (20).
 2. A testing device according to claim 1, wherein ameasuring device (71) for detecting the width of the bank notes iscoupled with the synchronous adjustment of the channel halves (21), withan appropriate bank note checking program that is dependent on the widthof the bank notes being activatable in the scanning devices by way ofsaid measuring device.
 3. A testing device according to claim 1, whereinthe channel halves (21) of the input channel (2) are in operativeconnection with a spring-tensioned lever bar assembly (25) which can becharged by way of a control cam (26) that is coupled with a drive motor(28) by way of a worm gear arrangement (29) for the proper adjustment ofthe channel halves (21).
 4. A testing device according to claim 1,wherein the channel halves (21) have a U-shaped cross section and areheld so as to be slidably movable by way of bearings (41) provided ontheir upper face on three equidistant transverse shafts (42) which areheld in oppositely disposed supporting walls (43).
 5. A testing deviceaccording to claim 4, wherein the central transverse shaft (42) isprovided in its center with a bearing pin (44) for accommodating athree-armed angle lever (40) of a spring-tensioned lever bar assembly(25) which can be changed by way of a control cam (26) that is coupledwith a drive motor (28) by way of a worm gear arrangement (29) for theproper adjustment of the channel halves (21), the three-armed anglelever (40) having flush lever arms (45) which are articulated to theoppositely disposed longitudinal sides of the channel halves (21) andhaving a further lever arm (48) with an end that is bent away at a rightangle and that receives a pin (49) which, due to the action of a tensionspring (50) connected with the further lever arm (48) and with the reartransverse shaft (42), is in force locking contact with the free end ofan adjustment rod (36) of the lever bar assembly (25).
 6. A testingdevice according to claim 5, wherein a free end region of the adjustmentrod (36) is held in a pin guide (38) that engages in a slot (37) andanother end of the adjustment rod (36) is articulated to a two-sidedlever (34) which is pivotal about a bearing pin (35) disposed at thecenter axis (24) of the testing channel (20), the two-sided lever (34)having an arm which serves as a cam follower (33) and which lies againstthe control cam (26).
 7. A testing device according to claim 3, whereinthe control cam (26) and a worm wheel (27) of the worm gear arrangement(29) are connected so as to rotate with one another and are rotatablymounted on a common shaft (31).
 8. A testing device according to claim1, wherein the transporting device (7) for the bank note (3) includes areversible-rotation drive motor for two endless toothed belts (8) thatextend parallel to one another at a defined distance and are placed ontopairs of rollers (9, 10) disposed within the path width of the bank note(3) in the region of the testing channel (20), with said rollers eachbeing faced, in the path of movement of the bank note (3), by a springtensioned pressure roller (15) or runner, with it being possible to liftthe two front pressure rollers (15) or runners directly facing the inputchannel (2) away from the toothed belts (8) under a positive control andagainst the force of a spring.
 9. A testing device according to claim 8,wherein the channel halves (21) of the input channel (2) are inoperative connection with a spring-tensioned lever bar assembly (25)which can be charged by way of a control cam (26) that is coupled with adrive motor (28) by way of a worm gear arrangement (29) for the properadjustment of the channel halves (21), wherein the worm gear arrangement(29) includes a worm wheel (27) and a shaft (31) on which the worm wheel(27) is mounted, wherein the front pressure rollers (15) are mounted onshafts (16), and wherein the shafts (16) of the front pressure rollers(15) and pins formed laterally onto the runners, respectively, are inoperative connection, in order to properly control their heightadjustment, by way of a spring tensioned lever arrangement (51) with afurther cam (52) which is fastened so as to rotate with the control cam(26) that charges the channel halves (21) and which is rotatably mountedon the shaft (31) of the worm wheel (27) of the worm gear arrangement(29).
 10. A testing device according to claim 9, wherein the testingdevice (1) includes a pair of oppositely disposed side walls (14), andwherein the lever arrangement (51) includes two flat levers (53) thatare longitudinally displaceable on the oppositely disposed side walls(14) of the testing device (1) and are each provided with a cam track(54) that is associated with the shaft (16) of the respective frontpressure roller (15) and with one of the pins of the front runners,respectively, and, at their ends opposite the cam track (54), withrespective indentations (55) into which engage diametral arms (57) of athree-armed pivot lever (58) that is charged by the further cam (52).11. A testing device according to claim 10, wherein the three-armedpivot lever (58) is mounted on a bearing pin (35) disposed at the centeraxis (24) of the testing channel (20), the three-armed pivot lever (58)additionally having a further arm which serves as a cam follower (59)and which is angled away from the diametral arms (57) of the three-armedpivot lever (58), the cam follower (59) lying against the further cam(52) due to the action of a tension spring (61) which engages thethree-armed pivot lever (58).
 12. A testing device according to claim11, wherein a spring-tensioned two-armed lever (62) is mounted on thebearing pin (35) that accommodates the three-armed pivot lever (58) ofthe lever arrangement (51) as well as a two-sided lever (34) of a leverbar assembly (25), with said two-armed lever (64) cooperating, on theone hand, with another cam (67) that is coupled with the drive motor(28) and, on the other hand, with two fork couplers (64, 65) thatgenerate positioning pulses.
 13. A testing device according to claim 12,wherein an end of the two-armed lever (62) facing the another cam (67)is configured as a cam follower (66) which, due to the action of atension spring (70) extending between an angled portion (69) of thetwo-armed lever (62) and a pin (60) disposed at an upper wall (30) ofthe testing device (1), lies against the another cam (67), with theanother cam (67) being fastened so as to rotate together with the wormwheel (27) of worm gear arrangement (29) and likewise being rotatablymounted on the shaft (31) of the worm wheel (27).
 14. A testing deviceaccording to claim 5, wherein a measuring device (71) for the detectionof the width of the bank notes includes a perforated disc (72) having aring of perforations (73) which is angled away from the disc and whichmoves in the forks of two mutually 90° offset fork couplers (74) thatgenerate positioning pulses, with the perforated disc (72) carrying atoothed wheel (76) that meshes with a toothed ring segment (77)connected with the angle lever (40) in order to adjust the channelhalves (21).